GitLab CI + Flutter: pub: command not found

In one of my projects, I used a GitLab environment to perform Flutter tests. For this, I setup my .gitlab-ci.yaml to use a Flutter docker image of cirrusci/flutter for code quality check or tests. The file looks like this:

code_quality:
  stage: test
  image: "cirrusci/flutter:stable"
  tags:
    - docker
  before_script:
    - pub global activate dart_code_metrics
    - export PATH="$PATH":"$HOME/.pub-cache/bin"
  script:
    - metrics lib -r codeclimate  > gl-code-quality-report.json
      
# [...]

test:
  stage: test
  image: "cirrusci/flutter:stable"
  tags:
    - docker
  before_script:
    - pub global activate junitreport
    - export PATH="$PATH":"$HOME/.pub-cache/bin"
  script:
    - flutter test --machine --coverage | tojunit -o report.xml
    - lcov --summary coverage/lcov.info
    - genhtml coverage/lcov.info --output=coverage

# [...]

Up to version 2.10.* of the Flutter docker image, this worked fine. But starting with version 3.0.0, there seems to be some changes in the binaries or their paths. The scripts failed with an error:

/usr/bin/bash: line 123: pub: command not found

To fix this error, the pub commands need to be adjusted and set to flutter pub:

# [...]

  before_script:
    - flutter pub global activate dart_code_metrics

# [...]

  before_script:
    - flutter pub global activate junitreport

# [...]

This fixed the issue and all tests finished successfully.

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